Portable planing-machine.



0. F. THORN.

PORTABLE PLANING MACHINE. APPLICATION nuzn'nme. 1915.

1,248,460. Patented 0ct.16,1917.

3 SHEETS-SHEET I.

Oacar 177710770 Hiiys O. F. THORN.

FOBTABLE PLANING MACHINE.

APPLKCATION HLED DEC-9.1915.

Lfi wfiwa Patented Oct. 16, 1917.

a SHEETS-SHEET 2.

4 Invenior 45 050a?" Z? Thorn 0- F. THOR N. PORTABLE PLMHNG MACHINE.APPLICATION FILED DEC-9.1915.

3 SHEETS-SHEET 3- 1,243,460. Patented 0et.16,1917.

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GSGAR F. THOBN, OF CHICAGO, ILLINOIS, ASSIGNOB TO G-ULBRANSEN-DICKINSONCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PORTABLE PLANING-MACHINE.

Specification of Letters Patent.

Patented Get. 16, 1917.

Application filed December 9, 1915. Serial No. 65,927.

' ence being had to the accompanying drawings, forming a part of thisspecification.

My invention relates to the art of wood working'and is directedspecifically to portable planing machines for performing certain kindsof operation upon wood.

In order to describe my invention, I shall refer to a particular usethereof, in connection with which use my invention was developed in aneffort to do by machinery what has heretofore been done by hand.

It is well known that in the art of piano manufacture the back of thesounding board is provided with a series of bracing or reinforcingstrips glued in position'and disposed parallel to each other in diagonaldirection. It is also well known that it is the practice to out downeach of the ends of each of these bracing or reinforcing strips in thenature of an elongated chamfer or splay. This operation is mostconveniently done, and probably properly done only when the strip arealready secured in place upon the sounding board, achisel being used anda templet being employed in order to guide the action of the cuttingtool. As previously pointed out, this operation has heretofore beenuniformly performed by hand, a tedious practice and one that consumes agreat deal of time. Accordingly, my invention provides a portable devicewhich comprises a power-driven rotary cutter which may be applied to,the ends of these strips in rapid succession to splay the ends neatlyand uniformly. My invention is illustrated in the accompanying drawingsin which; I

Figure 1 shows the back of a piano sounding board;

Fig. 2 shows the manner in which the device of my invention is employedand the structure which I provide for supporting it;

Fig. 3 is an under side view of the machineof my invention;

knives Fig. 4 is a plan view thereof;

Fig. 5 i a side elevational view thereof;

Fig. 6 is an end elevational view thereof; and

Fig. 7 is an interior elevational view.

It will be seen that I provide an electric motor 8, to which theflexible conductors 9, 9, lead, a switch 10 being provided upon thehousing of the motor to control the ap plication of the electriccurrent.

The inherent structure and characteristics of the electric motor do notform part of my present invention and it will be understood by thoseskilled in the art that any adaptable motor may be used.

The motor shaft 11, indicated in dotted line in F ig. 3, is providedwith an extension 12 upon which the rotary cutter is secured by means ofthe nut- 13, the outer end of the extension being journaled in a bearing14 carried in the wall 15 of a drum housing 16. The other wall 17 ofthis drum housing is secured to the frame of the electric motor by meansof bolts 18, 18, and also by means of bolts 19 which pass through abracket 20 secured upon the motor frame,

The rotary cutter is best shown in Fig. 7 where it will be seen that itcomprises a body 21 which carries four peripheral 22, 22, held inplace-by means of clamping plates 23, 23, secured to the body by meansof cap-bolts 24, 2 1. The cutting edges 25, 25, are all so disposed thatthey are equidistant from the axis of the motor shaft and it will beseen that the path in which these cutting edges rotate extends downbelow the bottom of the drum housing 16. I

The cutter body 21 is provided with a pocket 26 within which, asillustrated in dotted line in Fig. 6 and in full line in Fig. 3, a brakeband 27 is disposed, one end of this brake band being secured to a block28 having arcual adjustment by means of the adjusting screw '29, andbeing adapted to be held in any adjusted position by means of a clampingbolt 30 passing through an arcual slot- 31. The other end of this'brakeband is provided with a block 82 to which a crank arm-33 is connected,this crank arm extending from a crank shaft 3% bearing in the wall 15and provided outside the hous- 7 determined ing with a crank handle 35.When the crank handle is turned in the direction of the arrow 36, it isclear that the brake band will be expanded within thepocket 26 to brakethe movement of the rotary cutter.

Secured to the bottom of the wall l5 is a bracket 37, this bracket beingmade adjustableby means of the adjusting screws 38, 38, and being heldin any adjusted position by means of the cap-bolts 3 of the legs 40,etO, of this bracket carries a caster 41.

Upon the under side of the motor frame a generally similar bracket 42 isprovided, this bracket being adjustable by means of an adjusting screw&3 near each end thereof and being held in position by means of acapboltaa at each-end thereof. This bracket 42 carries the casters 45,4:5 and the arrangement is such that the fourcasters 41 4:1 and 4.5, 45,are adjusted to lie in a common plane and also made adjusta e 80. thatthe plane which these: casters define lies a predi'sta-nce from thedefined path of the rotary cutter.

A hoisting ring 46 is secured to the top oft-he inotor frame. The inotoris provided with a handle 47 and the drum housing 16 is provided with ahandle d8, the two handles thus lying opposite each other, and thesehandles are adapted to be grasped simultaneously in applying the machineto the article upon which work is tobe done. Since the combined motorand cutting device is comparativelyheavy, it is desirable to support thedevice, at least in part, in order to make it more convenient'to handle,but in iiowise interfering with the portable nature of the structure, InFig. 2 1 illustrate a rotatingbeam 49 hung upon a pivot Sha 50. suitablysuspended-from an overhead rafter 51. The beam .49 is reinforced byguywires52, 52, extending between the ends of; the beam and the hub, ofthe beam, and the planing'machine is hung from one end of the beam bymeans of-a hookr0d 53 through the intervention of a resilient element5%,; The other end of the beam 49 is counterbalanced by means of aweight 55. In the manufacture, which has been described, the soundingboard is placed upon a table, back up so as to expose the-bracingorreinforcing strip glued thereon, as; illustrated in Fig. 1. This tableis placed under the beam 49 and the resilient element which is employedis of such tension as, to just allow the planing machinelto rest uponthe sounding boa-rd in such position. hen it is desired to lift theplaning machine the two handles are grasped and in raising the deviceassistance is given 'bythe resilient element.

"In Figs. 1 and the sounding board is, illustrated at 56,. and thereinforcing or bracing strips at 57, 57. When the strips are 3 Each rglued to the sounding board they are of uniform cross-section throughouttheir entire lengths and the splaying of the ends is done after the'glueis thoroughly hardened. The'splay is formed by a circular gouge at ashort distance from the end of the strip and from the base of this gougeto the end of the strip, the strip is of uniform crosssection, thelatter result being secured by planingthe end of the strip outwardlyfrom the base of the gouge and to the depth of the gouge. The depth ofthe gouge is determined, as before indicated, by the proper adjustmentof the casters and the knives, and, once it is determined how far fromthe end of the strip the gouge shall be, the planing machine is loweredupon the-strip with the rotary cutter in motion and made to descenduntil the castersengagethebackthe crank handle 3:5 turned toapply thebrake.

I claim:

L In combination, a frame supporting a motor having a horizontalextended shaft, a

rotary cutter onthe extended portion of the shaft, a hood for the cuttercarried by the motor, reinforcing-means forming port on of said frameand assist ng n supporting said hood, and eooperatingmeans on the hoodand frame to regulate the depth of cut..

2. In combination, a frame, a motor in said frame having an extendedhorizontal driveshaft, a rotary cutter carried by the extended portionof said shaft, a hood for the cutterficarr-ied by the-motor, portions ofsaid frame being extended and connected to said hood to reinforcethesame, andbrackets adjustably carried by the hood and main frame toregulate the depth of cut.

3. In combination, a frame, a m tor in said frame. having an extendedhorizontal drive-shaft, a rotary cutter on the extended portion of theshaft, a hood for thecutter carried by the motor, reinforcing meansforming a portion of said frame and-assisting in supporting said hood,brackets adjustably carried by the hood and rnain frame to) regulate thedepth of cut, and casters carried by the bracketsvto permit movement ofthe machinev from place to P ac l. In combination, amain frame having aprime mover therein provided with an ex:

tended shaft, a rotary cutter on the shaft, a ing the depth of cutcarried by the hood and hood for the cutter carried by the prime frame.

mover, handles on said hood and prime In Witness whereof, I hereuntosubscribe l0 mover to manipulate the cutter, said frame my name this 6thday of December, A. D. having portions thereof extended to provide 1915.

reinforcing straps, said straps being connected to said hood, and meansfor adjust- OSCAR F. THORN.

Games of this patent may be obtained for five cents each, by addressingthe Gommissioner of Patents, Washington, D. G.

